[Python] How do I efficiently enhance my skills in python and SQL? What resources are best for...

I have been playing around in a terminal for Python and bigquery for SQL, but I do not have any projects that prove I know what im doing. I also do not have a way to track my proficiency in any of the languages. It seems I don't know what I don't know, and that gets discouraging. Is there a resource for me to track progress and indulge in trial and error scenarios so I can solidify my skills in Python and SQL?

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